Combination lock



FIG. 1 is a top perspective view of the combination lock;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a left end view thereof; and,

FIG. 8 is a right end view thereof. 

The ornamental design for a combination lock, as shown and described. 